1wall, and the
ends of these two beams where they meet are joined by means
of iron staples. On these beams and on the fifth long wall are placed ten
cross-beams, eight feet and three palms long, the first of which is placed on
the ninth transverse wall, the last on the tenth, the remainder in the space
between them; they are distant from one another three feet. Into the
ends of the cross-beams facing the second long wall, are mortised the ends of
the same number of rafters inclined toward the posts which stand vertically
upon the second long wall. This, again, is the manner in which the inclined
side of the furnace hood is made, just as with the others; at the top
where the fumes are emitted it is two feet distant from the vertical side.
The ends of the same number of rafters are mortised into the cross-beams,
where they are set in the fifth long wall; each of them is set up obliquely and
rests against the back of one of the preceding set; they support the roof,
made of burnt tiles. In this part of the building, against the second long
wall, are four furnaces in which lead is separated from silver, together with
the cranes by means of which the domes are lifted from the crucibles.
of iron staples. On these beams and on the fifth long wall are placed ten
cross-beams, eight feet and three palms long, the first of which is placed on
the ninth transverse wall, the last on the tenth, the remainder in the space
between them; they are distant from one another three feet. Into the
ends of the cross-beams facing the second long wall, are mortised the ends of
the same number of rafters inclined toward the posts which stand vertically
upon the second long wall. This, again, is the manner in which the inclined
side of the furnace hood is made, just as with the others; at the top
where the fumes are emitted it is two feet distant from the vertical side.
The ends of the same number of rafters are mortised into the cross-beams,
where they are set in the fifth long wall; each of them is set up obliquely and
rests against the back of one of the preceding set; they support the roof,
made of burnt tiles. In this part of the building, against the second long
wall, are four furnaces in which lead is separated from silver, together with
the cranes by means of which the domes are lifted from the crucibles.
In that part of the building which lies between the first long wall and
the break in the second long wall, is the stamp with which the copper cakes
are crushed, and the four stamps with which the accretions that are chipped
off the walls of the furnace are broken up and crushed to powder, and likewise
the bricks on which the exhausted liquation cakes of copper are stood to
be “dried.” This room has the usual roof, as also has the space between
the seventh transverse wall and the twelfth and thirteenth transverse walls.
the break in the second long wall, is the stamp with which the copper cakes
are crushed, and the four stamps with which the accretions that are chipped
off the walls of the furnace are broken up and crushed to powder, and likewise
the bricks on which the exhausted liquation cakes of copper are stood to
be “dried.” This room has the usual roof, as also has the space between
the seventh transverse wall and the twelfth and thirteenth transverse walls.
At the sides of these rooms are the fifth, the sixth, and the third long
walls. This part of the building is divided into two parts, in the first of
which stand the little furnaces in which the artificer assays metals; and the
bone ash, together with the other powders, are kept here. In the other room
is prepared the powder from which the hearths and the crucibles of the fur
naces are made. Outside the building, at the back of the fourth long wall,
near the door to the left as you enter, is a hearth in which smaller
masses of lead are melted from large ones, that they may be the more easily
weighed; because the masses of lead, just as much as the cakes of copper,
ought to be first prepared so that they can be weighed, and a definite weight
can be melted and alloyed in the furnaces. To begin with, the hearth in
which the masses of lead are liquefied is six feet long and five wide; it is
protected on both sides by rocks partly sunk into the earth, but a palm higher
than the hearth, and it is lined in the inside with lute. It slopes toward the
middle and toward the front, in order that the molten lead may run down
and flow out into the dipping-pot. There is a wall at the back of the hearth
which protects the fourth long wall from damage by the heat; this wall,
which is made of bricks and lute, is four feet high, three palms thick, and five
feet long at the bottom, and at the top three feet and two palms long; there
fore it narrows gradually, and in the upper part are laid seven bricks, the
middle ones of which are set upright, and the end ones inclined; they are all
thickly coated with lute. In front of the hearth is a dipping-pot, whose pit is
a foot deep, and a foot and three palms wide at the top, and gradually narrows.
walls. This part of the building is divided into two parts, in the first of
which stand the little furnaces in which the artificer assays metals; and the
bone ash, together with the other powders, are kept here. In the other room
is prepared the powder from which the hearths and the crucibles of the fur
naces are made. Outside the building, at the back of the fourth long wall,
near the door to the left as you enter, is a hearth in which smaller
masses of lead are melted from large ones, that they may be the more easily
weighed; because the masses of lead, just as much as the cakes of copper,
ought to be first prepared so that they can be weighed, and a definite weight
can be melted and alloyed in the furnaces. To begin with, the hearth in
which the masses of lead are liquefied is six feet long and five wide; it is
protected on both sides by rocks partly sunk into the earth, but a palm higher
than the hearth, and it is lined in the inside with lute. It slopes toward the
middle and toward the front, in order that the molten lead may run down
and flow out into the dipping-pot. There is a wall at the back of the hearth
which protects the fourth long wall from damage by the heat; this wall,
which is made of bricks and lute, is four feet high, three palms thick, and five
feet long at the bottom, and at the top three feet and two palms long; there
fore it narrows gradually, and in the upper part are laid seven bricks, the
middle ones of which are set upright, and the end ones inclined; they are all
thickly coated with lute. In front of the hearth is a dipping-pot, whose pit is
a foot deep, and a foot and three palms wide at the top, and gradually narrows.